oracle 集合运算符
aaarticlea/png;base64,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" alt="" />
UNION/UNION ALL 并集
aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAAMQAAACQCAIAAADY21PdAAATrklEQVR4nO2db2gb2bXAp6g2g8J6Z+vFnfrFqWKnihontYjjWDbe7FDvM5N92l2lfvEqdUymlTeVW2JETJ+nJcvULURQ02i7dRALC4KFh2D7Qa/9ELW8D9Nd6IpSil6hZZbuggJL0ZIvk3woE/Jl3ofrHF3rn0fSjGZ0NYfzxRvZO2f0u+eee+6551K6K66YJJTdD+AKOeLC5Ipp4sLkimniwuSKaeLC5Ipp4sLkimniwuSKaeLC5Ipp4sLkimniwuSKaeLC5Ipp4sLkimniwuSKadK7MN27TiGZf+sTu5/FfPnkrXmqmVy/Z/cT1pFehQl/2STSdBhMjrS7R2Haf9fXr1937jjtSJ7CVNeyCmnOMrw3Ydp/m/NvfXKPUJqawoT9u6O8U0/CVGEJQidHvVQT5DCYDv+ADdKLMB3kh0yaDmfFgXb3IEzVb9GBb7VzMQyT65k6kVp2niYJnPReOxWjMZOjbO45mOr5IQJpMraac5g37jGYGrxj8mgykmdynLW9BVPD8erIlXInYgQmx9HUUzA18f2k0XRITOTMia6XYDI0Wh31dtuXwwNsBw6fHoIJdnZ7zPm3JQZWa86jqXdgOjTIBsdFAk0uTFaKkQXb08845/W2LQZgcp61vQKTsTS3895vu2I4A+4kW3sDJsMe3Xmuv005BKZK/OikOb0nYGoBEVICJ0MrV6eNGSfCVCwW8/m8JEmSJEUiEW72xLMURVHU6De4KuF5XpKkTCYjy/L+LxNC06EwOYwjXdcdAlOhUEgmkzzPBwIBA+Oxofh8Po7jJEmSZVnTNLvNMiqyLOdyucrgaSxo8KTTaVmWVVW1+8GrxTaYisUiAoim6U4AaiKhUCiRSORyObtsbCT5fF4URY7jGIbpxECapjmOQzY6ga1uw1QqlSRJau6BGDYw6uemwxJ3LRPekpvo0kZuOixNzERHxkNN/iDLsvF4vFAodNlYXIrFoiRJHMd1Qk9zCQaD9g6eLsGkqmo6nQ4Gg3XfAsMG/PMCdy0T2S5cf0dvW6/cLi1t5M4sJobH6v+PfD6fKIrlcrk7Vuu6riiKKIo+n68JBCPjobFJ3vjg8c8Lo37OM9DQozMMIwhCJY7sllgOU7lcFkWx1p97h9hTF+JLG7mru+VOAGqkQkpFYD0zXP1F0jQtCIKiKJZanUwmGzng4bHgmcXE0kbuyu1SJzbG9rTwljwdlho5ZuSSS6WSdZbiYiFMxWJREIQq8wa9jH9eWNrIWQFQI41sF05diHuH2KqHiUQipg/fUqkkCEJtIAiDR0ipVtgY29MububrDh5kaRdmeUtgUlU1Ho/XDsfF9Ww3GarVi5v5sUm+9kWbMnZlWY5EInUZCm/J3TRz+VaxLlUcx1kaUZkPUzqdrprUxib5Lr/N5rqyo/jnD7hMmqZFUWx7QVQul2sxGvVzFzfz9loa2S5UWYqQKhaL5n7pSMyEqVAohEIHJu+xSX75VtF2eurq1d3ymcUEHsayLJvJZFoyWdM0SZKqJrWJmaijrL5yu3RmMTHoPTDC4/G46QsR02BKJpP4szJswPZxaURXdpSqiS8ajRp0Ufl8nmUPxGH+eaHDmNo6FVLqdFjCkWIYJplMmgWAbgpMiqLgDmnQy5y/lIztaba/PuO6tJHDw3OWZZuHq5qmVa0tRsZDHeY1uqNXd8tVEx/HcWa5qE5hymQyuJMfm+QtWupbrbE97dSFA4sGURTrmlwoFPA1v3eItX1h0apGtgt4NoFhGFMC845gwpdsngH6/KWk7a+pQ724mcddFM/zVVNeMpnEB49/XrBoqd8FnVtJ4SGjIAgdbmi2CZOmafj6hWEDKzuK7W/HFL26W8ajqGAwiBIHmqZFo1F8NueuZWx/2g41sl1g2ABubCdTXjswqaqKb4xMzER7K0IyonMrKTyE+vDDD/G4cGQ85NhAu1UVUurETGWQ+Hy+thMHLcNUKpXwnaYziwnbX4dFurie9QzQXxgYGhieH/jS7BcGhpDJpy7EbX820xUfPG2HUK3BpKoqTtLCatr2t2Cpzq/+N330P+mxKD0WpY9e9niPza2kbH8qi3RpI4cnDlpNubUGEz67eQbonkgjdaLnXs/uY4Tp2eX3bH8w63T5VhHfhGnVPxmFSdM0CBqIJyl290mAfxsAmuJenuJehh8D/Nuxu09sf0iL9OpuGQp4aJrO5/Pmw8TzlQVOz6VVWtLY3ScTXBLQWVr55sNHgw8fDa6svwD/cYJLEsyTkFJhidcST4ZgEkURSCJgPdxcJ8NpgObGj87pOgX6w5+cxf2T7Y9qnV65XYL5jmEYg7Vfh8OUy+WAJILDT6Szq78GXH525zROEtKf3TkNHzj3OskeGucpEAgYyWceApOiKJDwnZiJ2m6hpYqT9MbN2VqSav0T2Tyt7CiQIo9EIh3BpGkaJAIYNkBeZhLXpc0/AiKvrr2oPfY0gkl77MHjp//4r/+z/eEtfC0blXkplUq1D1MikUB/ZdDLEJPwravfevMfR46vAUmNMMJ1aeWb6PNHjq9d3rlvuwnWaZAXIRhvXkzREKZCodAny7e1O+pzgTgi4+TcKw8fDRqB6fMH9Mm5V9BvPX/6xnd++S/bDbFOYbOyefBUHyZN0yA/OTbJ226MpTr12ruICXZy+eNPh4yQhPT+Z0fYyWX0u5NhkjcDru6WoZiiUWVOQ5igbNIzQPdofZJBvXjzzxD9/F7+inGSkL73/vFKRmrzj7abY50urmdhpmo02dWBqVwuwwqO7FwAPsGt/WC+VZKQvnFzFv2F5wLxtTu9WttkRA+d7OrABHH38FjQdgMs1bPL77UaKtXqw0eDXz0b6YfJ7srtEmQK6q7sqmHC3VKXj0p2WS/v3IcZ6re/O9oeSUh/L3+lklb48d9tN806PX9pP/5hWbbWOVXD1D9uybfwU/T1r6y/0AlJSCHzNDoj2m6adRrb0yASr3VOB2DqH7cEcTdz4vL9z450DtPnD2jmxGX0Ny/e/LPtBlqnUEZX65wOwAQbusS7paNzb6Iv/oc/Ods5SUh/9e7JPndOB2CCI4VkuyWIlpgTlz9/QJsFk/bY02/OKRgM1ocpn8+jT3iHWLK34aDIpO10QCOFPWD/S7+w3UzrNLanwbIOP31QgQnO8RB8RuD6O/raHRW24f76t+fMhen+Z0dgWUf2hh0cC04kEtUw4aG3o5oumK7z1/4HSijNJQkpLOvIrhYPb8n75SQMA2H4PkyZTKZPQu/nT99AX/b7vzlmBUx/+ssw+vtDX4sRXNp7/R0dSuey2ewBmOB47nRYsv0prVMIvdnJ5SYVSx0qVBOQXeo0HZYQM4IgHIAJ2nORPcdBLWWTQsrOFcLwqdfetd1k63T5VhFmugpMxWIR1nG2P6KlCnNcGwUCxvWDj0agzsl2ky1VSDihOgJKxwpO/POC7c9nnb7647+j7/irZyPWkYQUtn77ZE0nSdI+THAmjuyKyhdi97owxyGFupTZ1V/bbrh1yl3bX7eFQqF9mCDxTXYdHByt/NW7J62GCYrmyM5eXt0tU09F0zRK0zT0w6CXsf3hrNPY3SeQqzRlZ7e5fvzpECQIbLfdUoWwSVEUCqJvsjNMkBQ4OfeK1SQhhX26b//8ge3mW6dQfpnL5ahsdr+2l+wzlovf/4OJ1UtGFM5Ckb3pe2YxARUEFCzlCOhI2UShP07dQ99WKGSbXojds91863RhNY34icfjFLQgJrsjBVQKvPf+8e7AtHv36/2wSXdxc7/YhOO4Ckxkt1yCpVyH5d7GFRZ0xJ8yQPwEg0EKkkyOut7EdB2dEdFX+6e/DHcHJjhl4Fv4qe3mW6cAk8/no+BuRrJ35Ya+FkNfbdtHmlpVKB/4cvCm7eZbqogflmUpOAZOdmsKqFnrDkk6VihH/A4d5C0paJrjwuTC1J5W7nRwYXJh6lArDXohZiLmvoq66sJknVYuYAGYyF7NQSWTC5PpWgnA4VAK2XkmgMnEg3LNFVZzZJ/JFFJqJV7qkww4HOF180zm6oGkJXSqIHtvzs2AW6RQCc5xHJVO72/UEXlZEWj39+agYzjZe3PQUS4ajVKyvH+abmQ8ZPuTWadwLuVWcqo7MN1KTvVD1QB0bEomk1S5vF95SXalJbT57n49E9mn5+Diw2w2S+m6DgfDCa4Bt7HSkuxGl3AFVLFYpHRdh+05srMDUAPehewA1IATn2SCjKWmaZSOXQJOdv8T6DvYhRi8T06nRLYLkGTaP+oE9zaRfaYA+p904dzc2g/m++HcHLQbQI11KF3XNU2DsIng7V440Wt12KQ99sDNBd968x+2G26dQsCELmClUMsB2KEjOw8OLeQ/+GjEOpgg9012wISfwFRVtQITnFHxBSO2P6V1CtekWHpG5caPzvVDuhLOhnMcd6CljqIo6B/IviwFTs9Z2rsC+jOR3WB+1L8/m6GuFQd6WsLl4AurxO4lxe4+sXqm++3vjtJPr1Kx3V7rFPZ3KYoqlUrVMMEmHdn7KjDTVV3mbJb2SU9LWMfxPF+n266qqrCmI7jqEtZ05jYBR/rXvz0HJZ2v3/6n7cZap1D3DQ0tD8DUP92b4QydidcTVLklsnOVcHFv1Y0XB2CCq1TJDsPxi1NMdE5Qp0v8rb2QXsKbgFfDpGNtd/vEOZlYkdJvbomm6XK53AwmaNdEtnOCHIFZzgmPlsjOCDRyS3Vgwp0T2bWX4JxMuUEFqpf61i3VhwmcE0VRke2C7QZYpPhVzx3mnPBrnwmOlmJ7GsMGGrml+jDp2LJueCxI8A1PAf5tRMAU93LbFxZ8/oCGRs3nXie5XXGQF2ERV+uWGsJULpfhzgKCT62s3VGhO8ru3a+3B9Oray/Cti7Bl6Us3ypCHVwmk6mLTX2YdOxqHs8ATXBdCjQHZ05cbuNI3fu/OdYncffIeKhqW7cFmHSsLmVkPETwZAfnM9nJ5Y8/HTJO0gcfjUChN9nXpMARFJqmFUVpB6ZSqQQbLATfhPHtnz+AyW6W5w0GT3io9PzpG9/55b9sN8Qihavl8AKBlmHSdR0aO1MUNbeSst0wi/Tyzn04bvDq2ouH8vTw0eAsz0N1AMGdvq/cLsE2XJMJzhBMuq7D+XHPAE1wpxRIYx5aUKA99gBJZIdKsT0NQiWfz4fKKTuCSdM0KHUa9DIEt76EU7/NSzHhsAA9Fl38/h9sf2zrFC5tomkaXQLWKUy6rpfLZbisxzvEEry4g8xTI57guiZ6LPri9/7X9ge2ToGkJrmAdmDSdb1YLELm6ZlhH6k8xe4+gX4pVTxpjz2wlUt87RtOUvOgux2YdF2XZRkWd/3D0xs3Z7XHnoePBiE5SZPeJQcnqe62iQkw6bqez+dxnkgtyIzdfeJ/6ReAzoXX/n2Kexl+JPhcZWxPw0mCm5wtgamKp0EvQ/BO8MmXdgEg0KnXiPVJQkqFAydtkNQOTIgniJ88A/TSRs72F2G6RrYLg17mi8+erpD0b8se7zFSx8+V2yWoCKAoKh6PtwFGOzDpul4sFqGBOEVRQZ6oHqALq2nY1KSHjh/9xndPzHzv2S8dg/FD2Lnni5v5QS8D32YqlWqPijZh0nW9VCpBLx6KokbGQwSEUEJK9QUjYBTDMJBfqRo/Y5M8AZWosT0Nbh9E+ST8tEn3YNJ1XVVVKMskYMiGt+TKzQ0UFQgE4HghknK5DPlbFDL2dEerlR0Fn9pYljWSmbQKJiTpdBpCcjRkey5rIKRUfICioAE/xAOiaZooivgnJ2aiPeeiYnva+UvJys0CFBWJRA7dLTlUTIBJ13VFUQKBCuOeATrIi71StbKwmsYjBoZhUIOYJlIoFPApb9DL9FAJ4dJGrnLbCUUxDGMwwX2omAOTXm/IeodYhy/0wlsynLVAwnFc3YLUWlFVFfrx738rbMDhs97yrSK++KcoKhQKNalPalVMgwlJsViEkjp4xdy1jNO81NJGruq1+ny+Qx1SrciyjK9CKIoaGQ8trjuuEjy8JeMLC4qiWJbtJNauKybDhCSXy+GzAPJS5y8lhZTNfWdjexp3LYM7eeTnk8lk3QjJoKTTadgIR/LMsG9hNe2EIbS4noUyEiQ0TUuS1Im9jcQSmHRd1zQtlUpVvWLPAD0xE11cz3b/LYe35FMX4vhiDWGUSCQ6Dzx1XVdVVZIkyOUiGfQy/nnBlrlvZUc5s5ioGjY0TQuCYHAeb0OsggmJpmmZTAaPzYEq/7ywtJGzmqrIduHMYqKKIeTkk8mkKRjhoqpq7RBCjvnUhXgXSgtXdpTpsIQv+GHYiKJoHUZIrIUJJJfLVcVSICPjoSAvXtzMmwJWbE8Lb8nTYWnUz+FLX5BAIGDW4qWJZDKZqlgKRtHYJH/+UtLEPZnIdmFuJeULRmrHDEVRPp8vlUqZPmzqSpdgQlIqlZLJZK2jqgwgNjDq56bD0txKKrwlG8nfRLYLi+vZ6bA0NslXLc2q3qkoiiauXIyIoiiJRKIqfMTBGvVzvmBkOiwtrKaN27u0kZsOS/55odGAoSiKZdl4PN5hErJV6SpMIOgt1x275kogEOj+O60VWZbj8XgjqkwUlmUFQWhjWWqK2AMTiKqq+XxeFMVGk2AbggDKZrNWhwhtSKlUymaz8XjcxIHEsmw0Gk2n0132u7ViM0xVoiiKLMuSJMXjcY7jqhZHdSUUCkUiEUmSstmsLMt2W9CayLKcy+UkSRIEwbi9PM9LkpROp2VZdtSA+X//yPpY9DaqiwAAAABJRU5ErkJggg==" alt="" />
INTERSECT 交集
aaarticlea/png;base64,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" alt="" />
MINUS 差集
我们知道group by 增强中 http://www.cnblogs.com/liuwt365/p/4181256.html
group by rollup(a,b)
=
group by a,b
+
group by a
+
group by null
所以我们应该写sql语句应该为:
SQL> select deptno,job,sum(sal) from emp group by deptno,job
2 union
3 select deptno,sum(sal) from emp group by deptno
4 union
5 select sum(sal) from emp group by null; select deptno,job,sum(sal) from emp group by deptno,job
union
select deptno,sum(sal) from emp group by deptno
union
select sum(sal) from emp group by null ORA-01789: 查询块具有不正确的结果列数
但是出错了,这是集合运算符的限制
1. 参与运算的各个集合必须列数相同 且类型一致
2. 采用第一个集合的表头作为最后的表头
3. 如果排序,必须在每个集合后使用相同的order by
4. 可以使用括号
SQL> select deptno,job,sum(sal)
2 from emp
3 group by rollup(deptno,job)
4 ; DEPTNO JOB SUM(DEPTNO)
------ --------- -----------
10 CLERK 10
10 MANAGER 10
10 PRESIDENT 10
10 30
20 CLERK 20
20 ANALYST 20
20 MANAGER 20
20 60
30 CLERK 30
30 MANAGER 30
30 SALESMAN 120
30 180
270 13 rows selected SQL> select deptno,job,sum(sal) from emp group by deptno,job
2 union
3 select deptno,to_char(null),sum(sal) from emp group by deptno
4 union
5 select to_number(null),to_char(null),sum(sal) from emp group by null; DEPTNO JOB SUM(SAL)
---------- --------- ----------
10 CLERK 1400
10 MANAGER 2450
10 PRESIDENT 5000
10 8850
20 ANALYST 3000
20 CLERK 800
20 MANAGER 2975
20 6775
30 CLERK 950
30 MANAGER 2850
30 SALESMAN 5600
30 9400
25025 13 rows selected
oracle 集合运算符的更多相关文章
- Oracle集合运算符 交集 并集 差集
集合运算符:UNION/UNION ALL 并集,INTERSECT 交集,MINUS 差集 一.union求并集,公共部分只有包含一次 例:求emp表ename中含’A‘或含有‘M’ SQL&g ...
- Oracle的集合运算符
Oracle的集合运算符有并集union.union all,交集intersect,差集minus 先建表myemp,进行集合运算的测试 create table myemp as select * ...
- 小谈KVC中KeyPath的集合运算符
由于知识点比较简单,这里不再陈述一大堆的原理,直入主题. KVC中的集合运算符有以下三类: 1.简单集合运算符:@avg.@sum.@max.@min.@count (只能用在集合对象中,对象属性必须 ...
- SQL的集合运算符介绍
最近学习了SQL SERVER方面的知识,毕竟做Web应用,少不了跟数据库打交道.学习的来源主要是<程序员的SQL金典>这本书. 今天介绍数据库里面的集合运算符,它是指匹配集合的每一个结果 ...
- 集合运算符之全集、交集、补集【weber出品必属精品】
集合的概念 与数学中的全集.交集.补集的概念是一样的 常用的集合运算符 集合运算符的作用:把两个查询构造为一个联合查询 1. 全集:求连个查询的全集 union all:将两个查询的所有数据全部列出, ...
- Oracle集合操作函数:union、intersect、minus
[转]Oracle集合操作函数:union.intersect.minus 集合操作符专门用于合并多条select 语句的结果,包括:UNION, UNION ALL, INTERSECT, MINU ...
- oracle 集合变量以及自定义异常的用法
oracle 集合变量以及自定义异常的用法, 在过程 record_practice 有record变量和自定义异常的用法实例.具体在3284行. CREATE OR REPLACE Package ...
- LINQ之路16:LINQ Operators之集合运算符、Zip操作符、转换方法、生成器方法
本篇将是关于LINQ Operators的最后一篇,包括:集合运算符(Set Operators).Zip操作符.转换方法(Conversion Methods).生成器方法(Generation M ...
- Oracle集合类型
Oracle集合类型介绍 集合类型 1. 使用条件: a. 单行单列的数据,使用标量变量 . b. 单行多列数据,使用记录 c. 单列多行数据,使用集合 *集 ...
随机推荐
- USB方向
Because the host is always the bus master, it is easy to remember USB direction: OUT means from the ...
- C语言学习--可变数组
#ifndef _ARRAY_ #define _ARRAY_ typedef struct { int *array; int size; } Array; //此处定义结构数据类型 Array,虽 ...
- MSSQL BACKUP WEBSHELL
Title:MSSQL BACKUP WEBSHELL -- Long Long Ago. Version:MSSQL 2005 && + ';alter/**/database/** ...
- Stockbroker Grapevine
http://poj.org/problem?id=1125 #include<cstdio> #include<cstring> #include<cmath> ...
- 玩玩SPARK
没有SCALA的东东,玩不起哈. ./spark-shell 从文件生成一个DRIVER? val logFile = sc.textFile("hdfs://192.168.14.51:9 ...
- h.264 率失真优化
Rate Distortion Optimization 搜索时,一个不可避免的问题就是如何对mv进行比较,从而得到最优 对于同一压缩算法来说,码率越高表示图像质量越好.失真越小,但是码率越高要求更大 ...
- LaTeX排版工具使用
专业的论文,都是用Latex.CTex等相关的工具.那么,用word写论文,缺点在哪? latex 写的东西,最终要编译成pdf格式的.里面的格式,尤其是数学类符号等,比较漂亮.这是word不能比的. ...
- Delphi HTTPRIO控件怎么设置超时参数
HTTPRIO控件怎么设置超时参数 //HTTPRIO1: THTTPRIO 设置5分钟超时 HTTPRIO1.HTTPWebNode.ConnectTimeout := 5000; Connect ...
- app开发历程——android手机显示服务器端图片思路
以前自己都不知道怎么去显示服务器端的图片,还好在apkbus论坛上找到一个特别简单的例子.虽然一天天忙忙碌碌,但是自己内心其实有一种想逃的心里,说不定哪天就会冒出来. 1.首先服务器端图片 这里的Im ...
- Search a 2D Matrix ——LeetCode
Write an efficient algorithm that searches for a value in an m x n matrix. This matrix has the follo ...